Blue Ash

Fraxinus quadrangulata

Oleaceae · broadleaf deciduous tree · introduced

Last updated April 25, 2026

Plant Profile

Size & Form

Height

50–70 ft

Spread

50-70 ft

Growth Rate

Medium

Site Requirements

Light

Full Sun

Soil Drainage

Moist

Soil pH

4.5-8.5

Water

Moderate

Drought Tolerance

Moderate to high

Hardiness

Zones 4a–8b

Ornamental Interest

Bloom Time

April to May

Fall Color

Yellow

Origin

southern Ontario to Michigan to Arkansas and Tennessee

Verticillium WiltHigh

Root Colonization Period

Peak Population & Dispersal

Fall webwormHigh

Larval Feeding & Web Building

Oystershell scaleHigh

Crawler Emergence

+ 5 more — see full disease and pest lists below

Diseases: Regionally Documented (8)

Neonectria ditissima Nectria Canker Discula destructiva (dogwood), Kabatiella and Discula spp... Anthracnose Coin Canker Symptom category — not a single disease Leaf Spot Mistletoe Phytophthora syringae Phytophthora Canker Verticillium dahliae Verticillium Wilt Sclerotinia spp. White Mottled Rot

Pests: Regionally Documented (8)

Ash borer Aphidoidea Aphid Prionoxystus robiniae Carpenterworm Hyphantria cunea Fall webworm Parthenolecanium spp. Lecanium scale Caloptilia syringella Lilac leafminer Lepidosaphes ulmi Oystershell scale Coccoidea Scale insect

Pests: Other Associations (1)

Agrilus planipennis Emerald ash borer

Data Maturity

Structured Multiple sources. Expert review underway.